module ActiveModel module Validations class ConfirmationValidator < EachValidator # :nodoc: def initialize(options) super setup!(options[:class]) end def validate_each(record, attribute, value) if (confirmed = record.send("#{attribute}_confirmation")) && (value != confirmed) human_attribute_name = record.class.human_attribute_name(attribute) record.errors.add(:"#{attribute}_confirmation", :confirmation, options.merge(attribute: human_attribute_name)) end end private def setup!(klass) klass.send(:attr_reader, *attributes.map do |attribute| :"#{attribute}_confirmation" unless klass.method_defined?(:"#{attribute}_confirmation") end.compact) klass.send(:attr_writer, *attributes.map do |attribute| :"#{attribute}_confirmation" unless klass.method_defined?(:"#{attribute}_confirmation=") end.compact) end end module HelperMethods # Encapsulates the pattern of wanting to validate a password or email # address field with a confirmation. # # Model: # class Person < ActiveRecord::Base # validates_confirmation_of :user_name, :password # validates_confirmation_of :email_address, # message: 'should match confirmation' # end # # View: # <%= password_field "person", "password" %> # <%= password_field "person", "password_confirmation" %> # # The added +password_confirmation+ attribute is virtual; it exists only # as an in-memory attribute for validating the password. To achieve this, # the validation adds accessors to the model for the confirmation # attribute. # # NOTE: This check is performed only if +password_confirmation+ is not # +nil+. To require confirmation, make sure to add a presence check for # the confirmation attribute: # # validates_presence_of :password_confirmation, if: :password_changed? # # Configuration options: # * :message - A custom error message (default is: "doesn't match # confirmation"). # # There is also a list of default options supported by every validator: # +:if+, +:unless+, +:on+, +:allow_nil+, +:allow_blank+, and +:strict+. # See ActiveModel::Validation#validates for more information def validates_confirmation_of(*attr_names) validates_with ConfirmationValidator, _merge_attributes(attr_names) end end end end